Problem 
Points 
Score 
1 
10 

2 
15 

3 
15 

4 
10 

5 
15 

6 
20 

7 
15 

Total 
100 

Physics 214 Spring 2001
Test 2, Mar 27
Name______________________
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Please show all work as this will be graded for partial credit.
1.(10pts ) A baseball is struck by Sammy Sosa at 120.0 ft/s at 30 degrees above the horizontal
from a point 3 feet above home plate. Will the ball clear the left field wall that is 10 feet high, and located 395 feet from home plate?
2.) a)(7pts)Essay: What is the difference between mass and weight?
b)(8pts) Essay: What is the difference between centripetal and centrifugal force?
3.) A 10 gram particle travels in a circular path of circumference 2 m, and makes 10 revolutions
per second.
a)(5pts) On the diagram show the acceleration, position, and velocity vectors
b)(5pts) Find the centripetal acceleration.
c)(5pts) Find the centripetal force.
4.(10pts) A particle of mass 2 kg has an initial velocity of i – 2j m/s. It is acted on by a force
.4i + j for 2 sec. What is its final velocity?
5.(15pts ) A 15 kg picture is suspended with two wires, as shown. If the wire used is rated at 100 N
should the picture be hung above a baby’s bed?
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6.(20pts) A raft is floating west at 3 km/hour relative to land. To a person on the raft, a water
skier appears to move away at 24 km/hour at 60 degrees S of W.
a.(10pts) Draw a diagram showing the reference frames and vectors involved.
b.(10pts) What is the velocity of the water skier relative to the shore?
7.(15pts) Two blocks with masses m1 = .2 kg, and m2 = .5 kg are connected
by a massless rope, and slide on a frictionless surface as in the figure. Find
the acceleration of the system and the tension in the rope.
m1
m2
Extra Credit (10pts): Do the same problem as 7, but include kinetic friction between the
large block and m1. Find the coefficient of kinetic friction given the new acceleration = 5 m/s/s.